When used in combination with the Canon EOS 5D Mark IV, behavior where the camera takes several seconds to start up when first switched on after mounting the lens has been improved.

When used in combination with the Canon EOS 5D Mark IV, behavior where power consumption was high with the lens mounted and where the camera’s battery charge would continue to drain even when the camera was switched off and stowed with the lenses mounted has been improved.

How to update the firmware

The firmware can be updated using the TAP-in Console (sold separately.) Using the TAP-in Console accessory, customers can update the firmware themselves.